Wall structure



FIG. 1 is an isometric view of the wall structure of our new design;

FIG. 2 is a front elevational view thereof, the rear elevational viewbeing identical thereto;

FIG. 3 is a right side elevational view thereof, the left side imagebeing identical thereto; and

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The ornamental design for a wall structure, as shown and described.